*{
    margin: 0;
    padding: 0;
}
a{
    text-decoration: none;
}
.fl{
    display:flex;
}
.fl-col{
    display: flex;
    align-items: center;
}
.fl-1{
    flex: 1;
}
.fl-center{
    display: flex;
    /* 水平居中 */
    justify-content: center;
    /* 垂直居中 */
    align-items: center;
}

.fl-a{
    display: flex;
    align-items: center;
}
.fl-j{
    display: flex;
    justify-content: center;
}
.fl-right{
    display: flex;
    justify-content: flex-end;
    align-items: center;
}
.fl-space{
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.fl-spaceA{
    display: flex;
    justify-content: space-around;
}
.fl-spaceB{
    display: flex;
    justify-content: space-between;
}
.position-r{
    position: relative;
}
.position-a{
    position: absolute;
}
.position-center{
    position: absolute;
    left: auto;
    right: auto;
    top: auto;
    bottom: auto;
    margin: auto;
}
input::placeholder{
    /* color:var(--minor-color); */
}
:root{
    --main-color:orange;
    /* minor 次要的*/
    --minor-color:#ccc;

}

.main{
    width: 100%;
}

.f-12{
    font-size: 12px;
}
.f-20{
    font-size: 20px;
}
.f-30{
    font-size: 30px;
}
/* f font  字体 */
.f-first{
    color: var(--main-color);
}
.f-minor{
    color: var(--minor-color);
}
.ml{
    margin-left: 20px;
}
/* b 背景 */
.b-first{
    color:var(--main-color)
}
.main{
    position: relative;
}
/* 高10 */
.body10{
    height: 10px;
}
/* 高 20 */
.h-20{
    height: 20px;
}
/* 小竖线 */
.line-col{
    width: 1px;
    height: 14px;
    background-color: var(--minor-color);
    
}


.margin-l10{
    margin-left: 10px;
}
.margin-r10{
    margin-right: 10px;
}
.margin-t10{
    margin-top: 10px;
}
.margin-t20{
    margin-top: 20px;
}
.margin-t30{
    margin-top: 30px;
}
.margin-t60{
    margin-top: 60px;
}
.margin-a{
    margin: auto;
}